<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>小孙同学&#10084;&#65039;</title>
    <script src="https://cdn.jsdelivr.net/gh/zyoushuo/Blog/hexo/js/mouse_slide.js"></script>
    <script src="https://cdn.jsdelivr.net/gh/zyoushuo/Blog/hexo/js/clicklove.js"></script>
  <style type="text/css">
    html, body {
      height: 100%;
      padding: 0;
      margin: 0;
      background: #000;
    }
    canvas {
      position: absolute;
      width: 100%;
      height: 100%;
    }
    .namebox{
      color: #fff;
      position: absolute;   
            top: 50%;   
            left: 50%;   
            -webkit-transform: translate(-50%, -50%);   
            -moz-transform: translate(-50%, -50%);   
            -ms-transform: translate(-50%, -50%);   
            -o-transform: translate(-50%, -50%);   
            transform: translate(-50%, -50%);   
    }
    .namebox h1{
      margin: 0 auto;
    }
  </style>

</head>
<body>
<canvas id="pinkboard"></canvas>
<script>
  var settings = {
    particles: {
      length: 500, // maximum amount of particles
      duration: 2, // particle duration in sec
      velocity: 100, // particle velocity in pixels/sec
      effect: -0.75, // play with this for a nice effect
      size: 30, // particle size in pixels
    },
  };
  (
          function(){
            var b=0;
            var c=["ms","moz","webkit","o"];
            for(var a=0;a<c.length&&!window.requestAnimationFrame;++a){
              window.requestAnimationFrame=window[c[a]+"RequestAnimationFrame"];
              window.cancelAnimationFrame=window[c[a]+"CancelAnimationFrame"]||window[c[a]+"CancelRequestAnimationFrame"]
            }
            if(!window.requestAnimationFrame){
              window.requestAnimationFrame=function(h,e){
                var d=new Date().getTime();
                var f=Math.max(0,16-(d-b));
                var g=window.setTimeout(function(){h(d+f)},f);b=d+f;return g}}if(!window.cancelAnimationFrame){window.cancelAnimationFrame=function(d){clearTimeout(d)}}}());
  var Point = (function() {
    function Point(x, y) {
      this.x = (typeof x !== 'undefined') ? x : 0;
      this.y = (typeof y !== 'undefined') ? y : 0;
    }
    Point.prototype.clone = function() {
      return new Point(this.x, this.y);
    };
    Point.prototype.length = function(length) {
      if (typeof length == 'undefined')
        return Math.sqrt(this.x * this.x + this.y * this.y);
      this.normalize();
      this.x *= length;
      this.y *= length;
      return this;
    };

    Point.prototype.normalize = function() {
      var length = this.length();
      this.x /= length;
      this.y /= length;
      return this;
    };
    return Point;
  })();

  var Particle = (function() {
    function Particle() {
      this.position = new Point();
      this.velocity = new Point();
      this.acceleration = new Point();
      this.age = 0;
    }
    Particle.prototype.initialize = function(x, y, dx, dy) {
      this.position.x = x;
      this.position.y = y;
      this.velocity.x = dx;
      this.velocity.y = dy;
      this.acceleration.x = dx * settings.particles.effect;
      this.acceleration.y = dy * settings.particles.effect;
      this.age = 0;
    };
    Particle.prototype.update = function(deltaTime) {
      this.position.x += this.velocity.x * deltaTime;
      this.position.y += this.velocity.y * deltaTime;
      this.velocity.x += this.acceleration.x * deltaTime;
      this.velocity.y += this.acceleration.y * deltaTime;
      this.age += deltaTime;
    };

    Particle.prototype.draw = function(context, image) {
      function ease(t) {
        return (--t) * t * t + 1;
      }
      var size = image.width * ease(this.age / settings.particles.duration);
      context.globalAlpha = 1 - this.age / settings.particles.duration;
      context.drawImage(image, this.position.x - size / 2, this.position.y - size / 2, size, size);
    };
    return Particle;
  })();
  /*

  * ParticlePool class

  */
  var ParticlePool = (function() {
    var particles,
            firstActive = 0,
            firstFree = 0,
            duration = settings.particles.duration;
    function ParticlePool(length) {
// create and populate particle pool
      particles = new Array(length);
      for (var i = 0; i < particles.length; i++)
        particles[i] = new Particle();
    }
    ParticlePool.prototype.add = function(x, y, dx, dy) {
      particles[firstFree].initialize(x, y, dx, dy);
// handle circular queue
      firstFree++;
      if (firstFree == particles.length) firstFree = 0;
      if (firstActive == firstFree ) firstActive++;
      if (firstActive == particles.length) firstActive = 0;
    };
    ParticlePool.prototype.update = function(deltaTime) {
      var i;
// update active particles
      if (firstActive < firstFree) {
        for (i = firstActive; i < firstFree; i++)
          particles[i].update(deltaTime);
      }
      if (firstFree < firstActive) {
        for (i = firstActive; i < particles.length; i++)
          particles[i].update(deltaTime);
        for (i = 0; i < firstFree; i++)
          particles[i].update(deltaTime);
      }
// remove inactive particles
      while (particles[firstActive].age >= duration && firstActive != firstFree) {
        firstActive++;
        if (firstActive == particles.length) firstActive = 0;
      }
    };
    ParticlePool.prototype.draw = function(context, image) {
// draw active particles
      if (firstActive < firstFree) {
        for (i = firstActive; i < firstFree; i++)
          particles[i].draw(context, image);
      }
      if (firstFree < firstActive) {
        for (i = firstActive; i < particles.length; i++)
          particles[i].draw(context, image);
        for (i = 0; i < firstFree; i++)
          particles[i].draw(context, image);
      }
    };
    return ParticlePool;
  })();
  /*

  * Putting it all together

  */
  (function(canvas) {
    var context = canvas.getContext('2d'),
            particles = new ParticlePool(settings.particles.length),
            particleRate = settings.particles.length / settings.particles.duration, // particles/sec
            time;
// get point on heart with -PI <= t <= PI
    function pointOnHeart(t) {
      return new Point(
              160 * Math.pow(Math.sin(t), 3),
              130 * Math.cos(t) - 50 * Math.cos(2 * t) - 20 * Math.cos(3 * t) - 10 * Math.cos(4 * t) + 25
      );

    }

// creating the particle image using a dummy canvas

    var image = (function() {
      var canvas = document.createElement('canvas'),
              context = canvas.getContext('2d');
      canvas.width = settings.particles.size;
      canvas.height = settings.particles.size;
// helper function to create the path
      function to(t) {
        var point = pointOnHeart(t);
        point.x = settings.particles.size / 2 + point.x * settings.particles.size / 350;
        point.y = settings.particles.size / 2 - point.y * settings.particles.size / 350;
        return point;
      }
// create the path
      context.beginPath();
      var t = -Math.PI;
      var point = to(t);
      context.moveTo(point.x, point.y);
      while (t < Math.PI) {
        t += 0.01; // baby steps!
        point = to(t);
        context.lineTo(point.x, point.y);
      }
      context.closePath();
// create the fill
      context.fillStyle = '#ff30c5';
      // context.fillStyle = '#ea80b0';
      context.fill();
// create the image
      var image = new Image();
      image.src = canvas.toDataURL();
      return image;
    })();
// render that thing!
    function render() {
// next animation frame
      requestAnimationFrame(render);
// update time
      var newTime = new Date().getTime() / 1000,
              deltaTime = newTime - (time || newTime);
      time = newTime;
// clear canvas
      context.clearRect(0, 0, canvas.width, canvas.height);
// create new particles
      var amount = particleRate * deltaTime;
      for (var i = 0; i < amount; i++) {
        var pos = pointOnHeart(Math.PI - 2 * Math.PI * Math.random());
        var dir = pos.clone().length(settings.particles.velocity);
        particles.add(canvas.width / 2 + pos.x, canvas.height / 2 - pos.y, dir.x, -dir.y);
      }
// update and draw particles
      particles.update(deltaTime);
      particles.draw(context, image);
    }
// handle (re-)sizing of the canvas
    function onResize() {
      canvas.width = canvas.clientWidth;
      canvas.height = canvas.clientHeight;
    }
    window.onresize = onResize;
// delay rendering bootstrap
    setTimeout(function() {
      onResize();
      render();
    }, 10);
  })(document.getElementById('pinkboard'));
</script>
<div class="namebox">
  <h1>小孙同学&#10084;&#65039;小爱同学</h1>
</div>
</body>
</html>
